landlinedialer.h Example File
declarative/landlinedialer/landlinedialer.h

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    #ifndef LANDLINEDIALER_H
    #define LANDLINEDIALER_H

    #include <QObject>

    class LandlineDialer : public QObject
    {
        Q_OBJECT
        Q_ENUMS(ConnectionState)
    public:
        LandlineDialer(QObject *parent = 0);

        enum ConnectionState {
            Disconnected = 0,
            Connecting,
            Connected,
            Engaged
        };

        Q_PROPERTY( ConnectionState state READ state NOTIFY stateChanged);
        ConnectionState state() const;

    public slots:
        void dialNumber(const QString& number);
        void hangup();

    signals:
        void stateChanged();

    protected:
        void timerEvent(QTimerEvent* event);
    private:
        void setNewState();
        int timerId;
        ConnectionState m_state;
    };

    #endif